Visual analysis of dimensionality reduction for exploring bat flight kinematics in a virtual environment

Authors:
J. Chen;M. Kostandov;I. V. Pivkin;D. K. Riskin;D. J. Willis;S. M. Swartz;D. H. Laidlaw
Affiliations:
Department of Computer Science, Brown University;Department of Computer Science, Brown University;Department of Material Science, MIT;Department of Ecology and Evolutionary Biology, Brown University;Mechanical Engineering, University of Massachusetts Lowell;Department of Ecology and Evolutionary Biology, Brown University;Department of Computer Science, Brown University
Venue:
JVRC'09 Proceedings of the 15th Joint virtual reality Eurographics conference on Virtual Environments
Year:
2009

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Abstract

We present an experiment to study two approaches for modeling complex skeletal motion of a bat in flight. Both the domain-enhancement approach and the data-fidelity approach use proper orthogonal decomposition (POD) to study animal locomotion. The motion was displayed in a fishtank virtual environment (VE) with a threedimensional user interface (3D UI) that supports flight comparison. The UI design was evaluated by biologists and engineering scientists, who explored the linear combinations of individual components described by POD and subsequently uncovered and verified patterns in animal locomotion using the two approaches. Our experimental results suggest that displaying experimental kinematics data in an interactive 3D visualization system gave the scientists an intuitive biological interpretation of biomechanical patterns of animal flight. In particular, feedback from experts who compared this environment with traditional two-dimensional (2D) graphs stressed the advantage of seeing inherently 3D data in a VE, letting them concentrate more readily on particular aspects of data analyses. Subsequently, they were able to notice new motion patterns as well as differences and similarities in flight behaviors. Comparison of the two modeling methods shows similarities in the types of motions presented.